Global Patent Index - EP 2023342 A1

EP 2023342 A1 2009-02-11 - Noise reduction with integrated tonal noise reduction

Title (en)

Noise reduction with integrated tonal noise reduction

Title (de)

Geräuschunterdrückung mit integrierter Unterdrückung tonaler Geräusche

Title (fr)

Réduction de bruit avec une réduction des bruits sonores intégrée

Publication

EP 2023342 A1 (EN)

Application

EP 08012861 A

Priority

  • US 95192207 P
  • US 96171507 A

Abstract (en)

The system provides a technique for suppressing or eliminating tonal noise in an input signal. The system operates on the input signal at a plurality of frequency bins and uses information generated at a prior bin to assist in calculating values at subsequent bins. The system first identifies peaks in a signal and then determines if the peaks are from tonal effects. This can be done by comparing the estimated background noise of a current bin to the smoothed background noise of the same bin. The smoothed background noise can be calculated using an asymmetric IIR filter. When the ratio of the current background noise estimate to the currently calculated smoothed background noise is far greater than 1, tonal noise is assumed. When tonal noise is found, a number of suppression techniques can be applied to reduce the tonal noise, including gain suppression with fixed floor factor, an adaptive floor factor gain suppression technique, and a random phase technique.

IPC 8 full level (invention and additional information)

G10L 21/02 (2006.01); G10L 21/0208 (2013.01)

CPC (invention and additional information)

G10L 21/02 (2013.01); G10L 2021/02085 (2013.01)

Citation (applicant)

EPHRAIM, Y.; MALAH, D.: "Speech Enhancement Using A Minimum-Mean Square Error Short-Time Spectral Amplitude Estimator", IEEE TRANS. ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, vol. 32, no. 6, December 1984 (1984-12-01), pages 1109 - 1121

Citation (search report)

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

Designated extension state (EPC)

AL BA MK RS

EPO simple patent family

EP 2023342 A1 20090211; CA 2638265 A1 20090125; CA 2638265 C 20130618; JP 2009031793 A 20090212; KR 20090012154 A 20090202; US 2008167870 A1 20080710; US 8489396 B2 20130716

INPADOC legal status


2010-03-03 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20090812

2009-10-14 [AKX] PAYMENT OF DESIGNATION FEES

- Designated State(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

2009-10-14 [AXX] PAYMENT OF EXTENSION FEES

- Payment date: 20080716

- Countries: AL

2009-10-14 [AXX] PAYMENT OF EXTENSION FEES

- Payment date: 20080716

- Countries: BA

2009-10-14 [AXX] PAYMENT OF EXTENSION FEES

- Payment date: 20080716

- Countries: MK

2009-10-14 [AXX] PAYMENT OF EXTENSION FEES

- Payment date: 20080716

- Countries: RS

2009-02-11 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20080716

2009-02-11 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

2009-02-11 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Countries: AL BA MK RS